Improvement in relief-valves



T. T. PBUSSEB. Rlief-Valye.

Paiented June 29,1875.

Fig. 1.

a Fig.3

17 12522635423: Eire]? 02": Q

UNITED STATES PATENT OFFICE.

TREAT T. rnossna, or CHICAGO, ILLINOIS.

IMPROVEMENT IN RELIEF-VALVES.

Specification forming part of Letters Patent No. 165,]. 19, dated June29, 1575; application filed March 1, 1875.

To all whom it may concern:

Be it known that I, TREAT T. Pnossnn, of

Chicago, in the county of Cook and State of Illinois, have invented aSafety- Valve, of which the following is a specification, referencebeing had to the accompanying drawing, which forms a part hereof. Myinvention consists in the combination of the valve and spring, ashereinafter fully described, by means of which the tension of the springis regulated, so as to hold the valve to resist a certain pressure.

In the accompanying drawings, Figure 1 represents a side elevation of mysatety-valve; Fig. 2, a transverse sectional view taken at the line :20x in Fig. 3. Fig. 3 is an end eleva- 1 tion.

' which pass through the valves E, and screw into the cores. The ends ofthe spiral spring G are fastened to the cores F, into which the screws Hscrew.

It will be observed that byturning the screw H the tension of the spiralspring G is varied, and the pressure of the spring to hold the valvesclosed is regulated. The pressure within the pipe will not open thevalves or the couplingoint ot' the hose used for throw ing water bysteam-engines. The tension applied to the valves may be regulated, so asto admit of the escape of water, and prevent the hose from bursting. Itmay also be applied in all of the places where a steam safety-valveisrequired.

I claim- The combination of the valves E, arranged opposite each otherwithin, the coupling, and spring G, as and for the purpose specified.

TREAT T. PROSSER.

I11 presence of- L. A. BUNTING, HEINRICH F. BRUNS.

